Controlled Descent System Switch (Freelander 2)

The HDC switch controls the selection of the HDC function.

The HDC switch is not a latching switch. It is mounted on the floor console, in front of the gear selector lever. Briefly pressing and releasing the HDC switch connects the ignition-on power supply circuit to the ABS module. When the HDC switch is pressed and released once, the ABS module enables HDC. Pressing and releasing the HDC switch a second time causes the ABS module to disable HDC operation.

To prevent misuse or if the HDC switch is broken, if the switch is not pressed for more than 10 seconds, there is no change in status. If the input signal from the HDC switch is kept high for more than 1 minute, a DTC is generated in the ABS module memory.

Activation of brake lights when HDC is operating

The operation of the vehicle's brake lights during HDC operation is controlled by the CJB. The ABS module monitors the hydraulic pressure in the brake system and requests the CJB via the high-speed CAN bus to activate the brake lights during active braking.

A pressure threshold and a filter with timer prevent the brake lights from flashing when braking using HDC.

Vehicles equipped with the Stop/Start system - starting from 2010 MY

Activating the Hill Descent Control system will deactivate the Stop/Start system. However, if the Hill Descent Control system is activated with the engine off during a Stop/Start cycle, the engine will automatically restart. If the Stop/Start system does not detect the driver at this time, for example if the driver's seat belt is not fastened or a door is open, the engine will not restart. The Stop/Start system prompts the driver to press the clutch pedal to start the engine. The message center screen displays the message "RESTART REQUIRED PRESS CLUTCH".

The driver must respond to this request within a limited period of time. Otherwise, a normal restart of the engine via the ignition switch is required. For further information, refer to the chapter: Starting system (303-06C Starting system - 2.2L Duratorq - Td4, Vehicles manufactured from 03/2009, Description and function).